Improvement in ventilating apparatus



U ITED STATES FRANCIS GREAVES, OF

PATENT OFFICE. Y

BROOKLYN, NEW' YORK.

IMPROVEMENT IN VENTILATING APPARATUS.

Specification forming part of Letters Patent No. 179,784, dated July 11, 1876; application filed September 12, 1874.

To all whom it may concern Be it known that I, FRANCIS GREAVES, of Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Apparatus for Ventilation, of which thetbllowing is a specification:

The object of my invention is to produce an apparatus for ventilation, by means of which the heat employed therein to produce an up ward current will not radiate through the main ventilating-tube to the apartment wherein it is located. I employ within the main ventilating-tube a chamber, wherein is located a coil of steam-pipe, whereby the air contained in this chamber is heated independently of that contained in the main tube, but mingles therewith at the top of said chamber, wherefrom it rushes, carrying with it the contents of main tube, which thus becomes warmed above the temperature of the external atmosphere, and hence compelled to ascend rapidly, inducing a general upward currentofits whole contents, which is being constantly supplied through proper openings hereafter described. In order, however, to fully describe my invention, that its usefulness and novelty may be readily observed, I will proceed at once with the general description, having reference to the accompanying drawing, which represents, 1n

Figure a vertical section, and Fig. 2 a front outline view, of the entire apparatus.

The letters of reference marked thereon correspond with similar letters used in this description; therefore, any person skilled in the art is enabled'to make and use the same.

Ais themain ventilation-tube, being enlarged, as shown at F, when desirable to produce space for additional air-inlets through openings G, provided with hinged doors to regulate the flow, as hereinafter described, which are multiplied generally by the length of the tube or the increased number of apart- ,men ts requiring ventilation. B is a chamber located in tube A, and is provided with a coil of steam-pipe, (represented by 0,) by means of which air contained in said chamber is highly and uniformly heated, and thus caused to ascend through the top open end of said chamber.

By this means the tube A at this point is prevented from becoming hot, while the air contained therein is uniformly warmed, and at the same time urged upward by the contents ot'B, which rush out, as above st'al ed.

D and E are doors located in tube A and chamber, to give access thereto, and the material composing them may be either transparent or opaque, preferably the former, when an ignited gas-jet is used to induce an upward current, as provided for by the burner H, located in the said chamber. But I wish here to state that I am aware that the application of agas-jet for this purpose is not new; that the same may be found in old (printed) works on ventilation. v R-is an opening into tube A, and is regulated by valve S, operated by cord T, attached thereto, which passes over a pulley, V, (or an eye,) located in shield U.. Passage G is controlled by a similar arrangement, which is represented by letters corresponding precisely with those employed in the foregoing de-' scription.

IYhat I claim as my invention, and desire to secure by Letters Patent of the United States, is

The combination of the outer tube A and inner tube B with the steam-heater or gas or lamp burner,arranged within the same, for the purpose of inducing an upward current of air through the ventilator, substantially as described.

FRANCIS GREAVES.

Witnesses:

CHAS. T. MASON, RoBT. M. FRYER. 

